cik_mm_wdoorbell(9)

💖 NAME 💖

okay so bestie, welcome to this Kernel API Manual page for cik_mm_wdoorbell(9) ✨ the name is literally cik_mm_wdoorbell — write a doorbell dword. that's the whole assignment, and we're gonna slay it 💅

✨ SYNOPSIS ✨

void cik_mm_wdoorbell (struct radeon_device *rdev , u32 index , u32 v );

🎀 ARGUMENTS 🎀

• rdev — radeon_device pointer. yes bestie, it's the radeon device pointer, no cap.
• index — doorbell index. it's the doorbell slot you're pointing at.
• v — value to write. literally the value going into the doorbell aperture.

🦋 DESCRIPTION 🦋

Writes v to the doorbell aperture at the requested doorbell index (CIK). that's it, that's the entire vibe: rdev, index, v go in, and v gets written to the doorbell aperture at that index. iconic little doorbell moment 🔔✨

🌸 SEE ALSO 🌸

The kernel file where this lives, plus the full CIK/dce8 friend group — every single one is invited to the group chat:

• Kernel file — ./drivers/gpu/drm/radeon/cik.c
• cik_get_allowed_info_register(9), cik_get_xclk(9), cik_mm_rdoorbell(9), cik_srbm_select(9)
• ci_mc_load_microcode(9), cik_init_microcode(9), cik_tiling_mode_table_init(9), cik_select_se_sh(9)
• cik_create_bitmask(9), cik_get_rb_disabled(9), cik_setup_rb(9), cik_gpu_init(9)
• cik_scratch_init(9), cik_ring_test(9), cik_hdp_flush_cp_ring_emit(9), cik_fence_gfx_ring_emit(9)
• cik_fence_compute_ring_emit(9), cik_semaphore_ring_emit(9), cik_copy_cpdma(9), cik_ring_ib_execute(9)
• cik_ib_test(9), cik_cp_gfx_enable(9), cik_cp_gfx_load_microcode(9), cik_cp_gfx_start(9)
• cik_cp_gfx_fini(9), cik_cp_gfx_resume(9), cik_cp_compute_enable(9), cik_cp_compute_load_microcode(9)
• cik_cp_compute_start(9), cik_cp_compute_fini(9), cik_cp_compute_resume(9), cik_gpu_check_soft_reset(9)
• cik_gpu_soft_reset(9), cik_asic_reset(9), cik_gfx_is_lockup(9), cik_mc_program(9)
• cik_mc_init(9), cik_pcie_gart_tlb_flush(9), cik_pcie_gart_enable(9), cik_pcie_gart_disable(9)
• cik_pcie_gart_fini(9), cik_ib_parse(9), cik_vm_init(9), cik_vm_fini(9)
• cik_vm_decode_fault(9), cik_rlc_stop(9), cik_rlc_start(9), cik_rlc_resume(9)
• cik_enable_interrupts(9), cik_disable_interrupts(9), cik_disable_interrupt_state(9), cik_irq_init(9)
• cik_irq_set(9), cik_irq_ack(9), cik_irq_disable(9), cik_irq_suspend(9)
• cik_irq_fini(9), cik_get_ih_wptr(9), cik_irq_process(9), cik_startup(9)
• cik_resume(9), cik_suspend(9), cik_init(9), cik_fini(9)
• dce8_line_buffer_adjust(9), cik_get_number_of_dram_channels(9), dce8_dram_bandwidth(9), dce8_dram_bandwidth_for_display(9)
• dce8_data_return_bandwidth(9), dce8_dmif_request_bandwidth(9), dce8_available_bandwidth(9), dce8_average_bandwidth(9)
• dce8_latency_watermark(9), dce8_average_bandwidth_vs_dram_bandwidth_for_display(9), dce8_average_bandwidth_vs_available_bandwidth(9), dce8_check_latency_hiding(9)
• dce8_program_watermarks(9), dce8_bandwidth_update(9), cik_get_gpu_clock_counter(9)

mwah 💖 this page’s source/version is ./drivers/gpu/drm/radeon, and the date on the footer is October 2026 — periodt.